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Loan Servicing (Tables) | 12 Months Ended
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Dec. 31, 2020
Payments for (Proceeds from) Mortgage Servicing Rights [Abstract] |
Originated Mortgage Servicing Rights |
| December 31 2020 |  | December 31 2019 |  | December 31 2018
Mortgage servicing rights |  |  |  |  |
Balances, January 1 | $ | 15,046 |  |  | $ | 12,876 |  |  | $ | 12,189 |
Servicing rights capitalized | 5,530 |  |  | 3,547 |  |  | 1,883 |
Amortization of servicing rights | (2,932) |  |  | (1,377) |  |  | (1,196) |
Balances, December 31 | 17,644 |  |  | 15,046 |  |  | 12,876 |
Impairment allowance |  |  |  |  |
Balances, January 1 | (719) |  |  | (527) |  |  | (587) |
Additions | (5,106) |  |  | (234) |  |  | (78) |
Reductions | 653 |  |  | 42 |  |  | 138 |
Balances, December 31 | (5,172) |  |  | (719) |  |  | (527) |
Mortgage servicing rights, net | $ | 12,472 |  |  | $ | 14,327 |  |  | $ | 12,349 |

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